1 files changed, 1 insertions, 1 deletions

diff --git a/ADMIN.md b/ADMIN.md
index 32523c1..6f6021e 100644
--- a/ADMIN.md
+++ b/ADMIN.md
@@ -20,7 +20,7 @@ Avoid [hard line breaks][].
 [CommonMark]: <https://commonmark.org/>
   "CommonMark - strongly defined, highly compatible specification of Markdown"
 
-[ATX headings] <https://en.wikipedia.org/wiki/Aaron_Swartz#Markdown>
+[ATX headings]: <https://en.wikipedia.org/wiki/Aaron_Swartz#Markdown>
   "ATX headings - header markup using leading hashtags"
 
 [semantic linewrapping]: <https://scott.mn/2014/02/21/semantic_linewrapping/>